对我的Web应用程序的请求超时，我使用jstack转储了线程堆栈，部分结果是：
http--2801-4$1476360005" #25 daemon prio=5 os_prio=0 tid=0x00007fa884011000 nid=0x6b67 runnable [0x00007fa87f532000]
java.lang.Thread.State: RUNNABLE
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
- locked <0x00000000910e2f20> (a java.net.SocksSocketImpl)
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
at java.net.Socket.connect(Socket.java:589)
at java.net.Socket.connect(Socket.java:538)
at sun.net.NetworkClient.doConnect(NetworkClient.java:180)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:432)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:527)
- locked <0x00000000910e2e98> (a sun.net.www.http.HttpClient)
at sun.net.www.http.HttpClient.<init>(HttpClient.java:211)
at sun.net.www.http.HttpClient.New(HttpClient.java:308)
at sun.net.www.http.HttpClient.New(HttpClient.java:326)
at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1202)
at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1138)
at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1032)
at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:966)
at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1316)
- locked <0x00000000910e2358> (a sun.net.www.protocol.http.HttpURLConnection)
at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1291)
- locked <0x00000000910e2358> (a sun.net.www.protocol.http.HttpURLConnection)
at com.caucho.hessian.client.HessianProxy.sendRequest(HessianProxy.java:298)
at com.caucho.hessian.client.HessianProxy.invoke(HessianProxy.java:166)
at com.sun.proxy.$Proxy45.getSimilarity(Unknown Source)
at com.coola.component.search.share.SearchClientNew.getSimilarity(SearchClientNew.java:78)
...
让我感到困惑的是，等待IO资源的线程的状态应该是BLOCKED（根据this post），为什么它是RUNNABLE？